Push in the insert, preferably with a press, not a hammer. The insert is forced into a hole, without impact or bouncing, by axial pressure in a press with a punch.
The insert rotates slightly in the direction of the knurling. The punch must be smooth to allow the insert to rotate. The insert must be held axially, since any inclination will result in radial loads which may damage the material.
Under the effect of the insert, the plastic deforms and takes the specific shape of the insert, thereby guaranteeing good torque resistance and holding force.